Endress+Hauser Micropilot FMR62, Technical Information

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Micropilot FMR62
32 V. 4, Rev. 2, 19-03-2018 Hauser
Measurement through a ball valve
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• Measurements can be performed through an open full bore ball valve without any problems.
• At the transitions, no gap may be left exceeding 1 mm (0.04 in).
• Diameter of opening of ball valve must always be equivalent to pipe diameter; avoid edges and
constrictions.
Measuring through plastic tank ceilings or dielectric windows
• Dielectric constant of the medium: ε
r
≥ 10
• The distance from the lower edge of the antenna to the tank ceiling or window should be about
100 mm (4 in).
• If possible, avoid mounting locations where condensation or build-up might occur.
• In case of outdoor mounting, the space between antenna and vessel has to be protected from the
elements.
• Do not mount any potential reflectors (e.g. pipes) outside the tank in the signal beam.
Suitable thickness of the tank ceiling or dielectric window
Material PE PTFE PP Perspex
DK (= ε
r
) 2.3 2.1 2.3 3.1
Optimum thickness 1.25 mm
(0.049 in)
1)
1.3 mm (0.051)
1)
1.25 mm
(0.049 in)
1)
1.07 mm
(0.042 in)
1)
1) or an integer multiple of this value; however, take into account that the microwave transparency is
significantly reduced when increasing the thickness of the window.
Installation: integrated
antenna
Radial alignment of the antenna
Based on the directional characteristic, radial alignment of the antenna is not necessary.
Information concerning nozzles
The maximum nozzle length H
max
depends on the nozzle diameter D :
H
max
øD
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